Steam-brake for locomotives



(No Model.)

D. s. RANDOLPH.

S'tfam'Brake for'Locomotives.

ATTEST: INVENTORI N. Pneus, Pnu-unhngmphw, washing@ uA c.

s UNITED STATES l PATENT OFFICE.

DAVID S. RANDOLPH, OF ST. LOUIS, MISSOURI.

STEAM-BRAKE FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 241,511, dated May 17, 1881.

Application iiled August 26, 1880. (No model.)

To all 'whom it may concern ing the brake-shoes of both wheels; and the` present improvement consists, first, in the provision of a fixed vertical cylinder supported on a bracket-plate secured to the frame of the locomotive, the pistou'rod ot' which cylinder has connection, by suitable links or their equivalent, with a pair of bell-crank levers pivoted in the brake-heads and to the ends of an adjustable stay or distance rod, so that any upward movement of the piston-rod will tend to apply the brake-heads, the brakeheads being supported by links or hangers dependent from a bracket secured to the locomotive -frame 5 secondly, in a construction and arrangement of parts, as hereinafter more fully set forth, whereby the brake-shoes proper are attached to the brake-heads without the use of rivets or bolts; thirdly, in certain details of construction, as will hereinaftermore fully appear.

In the drawings, in which similar letters ot' reference indicate like parts, Figure 1 is a side elevation illustrating my invention. Fig. 2 is a transverse section. Fig. 3 is a detail sectional plan of piston-rod and connections to draw-links. Fig/I is a perspective view of the hanger-bracket for hanger-links of brakeheads. I

A A are portions of the locomotive-frame, to which the bracket-plate B is secured by the channel-plate O extending between the frame A A', and rigidly bolted thereto and to the plate B, as shown in Fig. 2. The upper end of the frame or plate B is formed with a hori zontal bracket, b, upon which is arranged the vertical cylinder D, having a stuftlngbox, D', at its lower end, through which passes the piston-rod d. At its lower end the piston-rod is formed into an eye, d', at each side ot'\\'hich is attached eye-plates e to form a cross-head, and between which the pull rods or bars E are pivoted, as clearly indicated in Figs. l, 2, and 8. The pull-rods E are pivoted at their lower ends to the long arms ff ot' bell-crank levers F F, that are pivoted at their elbows f' f in the brake-heads G and at the ends ot" their short arms in the distance or stay rod H.

With this construction it will be readily seen that any upward movement of the piston will apply the brake-heads to the wheels, and that when the steam is allowed to escape from the operating-cylinder D the brake-heads will swing away out ot' contact with the wheels by their own Weight.

The brake-heads G G are supported by han g ers G2 G2, pivoted at g in a recess in the lbrakeheads, and at g to the han ger-bracket I, which is formed witlrlf'a dat portion, i, by which it is secured to the pla-te B, outwardly-bent portion fi and pivot-lugs i2 for the han-gers G2, as clearly indicated iu Fig. 4, the purpose being` to bring the pivotfpoints g i2 out to or near the center line of the brake-heads, and thus obviate the necessity of bending the hangers G2, or require but a very slight bend in the same.

The distance or stay rod H is made adjustable in the following manner, so as to allow of the adjustment of the brake-blocks with relation to the wheels: The rod is divided into two portions, lb h', one of which has a righthand and the other a lefthand screw-thread. On these two portions the right-and-lefthandscrew-threaded sleeve H screws to adjust the length of the rod.

h2 are lock-nuts to hold the parts in the position to which they are set.

The rod II is provided at each end with ears hfor the reception of set-screws h4, that bear against the lower end of the brake-head, and by means of which said brake-heads are adjusted in proper relative position to the locomotive drive-wheels and their upper ends kept from rubbing ou said wheels when not in use.

J is a bracket-plate, similar in construction to the hanger-bracket I, and having ears j, which form guides-for the brake-head and prevent any outward movement ot' the same.

The brake-heads G G are formed of the ordi nary cast-iron heads or blocks, G, and wrought shoes G, which are T-shaped in cross-section 1 tion 2 of said shoes beinO reduced and bent over the upperend of the web g3, as clearly indicated in Figs. land 5 of the drawings, the purpose being to support the shoe and hold it in proper position without the use of bolts or rivets ordinarily used for such purpose.

I claim- 1. The combination, in a steam-brake for locomotives, etc., of the vertical fixed cylinder D, pull-rod E, connected direct to bell-crank levers F, distance-rod H, and brake-blocks G, all arranged substantially as and t'or the purpose set forth.

2. The combination, in a brake for locomotives, 85e., of the distance-rod H, consisting of parts h h', provided with cars It for the reception ot' set-screws h4, adjusting-sleeve H', and lock-nuts h2, as described, and for the purpose set forth.

3. The combination, in a brake for locomotives, &;c., ot the cylinder D, with piston-rod d, having eye d at its lower end, eye-plates c, and pull-rods E, all arranged as described, and for the purpose set forth.

4. The combination, in a brake for locomotives, &c., of the bracket-plate I, constructed and arranged as described, and' brake-head hangers G2, as and for lthe purpose set forth.

5. The' combination, in a brake for locomotives., &c., of the brake-heads G and stay-rod H, provided with ears h3 and set-screws h4, all arranged as and for the purpose set forth.

6. The combination, in a brake-head for locomotives, Src., ot' the head G and shoe G',

when said shoe is secured to the head by having its top portion, g2, bent over the upper end of the web g3 of the head G, substantiallyT as and for the purpose set forth.

7. In a steam or similar brake for locomotives, Sac., the combination, with the brakeheads, of a distance-rod, elbow or bell-crank levers pivoted on the distance-rod and on the brake-heads, a vertical cylindervxed to the frame above and on a line passing between the brakeheads, and intermediate pull-rodsor links for connecting the piston-rod of the cylinder directlyT to the bell-crank levers, all constructed and adapted to operate substantially as and for the purpose specified.

S. In a steam orsimilar brake for locomotives, 85e., the combination, with the brake- `a guide-bracket for preventing the outward movement of the brake-head, substantially as and for the purpose specified.

DAVID S. RANDOLPH.

Witnesses ROBERT BURNS, GEORGE BULLocK. 

